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Simplifying (n + 3) * 3 = n + 21 Reorder the terms: (3 + n) * 3 = n + 21 Reorder the terms for easier multiplication: 3(3 + n) = n + 21 (3 * 3 + n * 3) = n + 21 (9 + 3n) = n + 21 Reorder the terms: 9 + 3n = 21 + n Solving 9 + 3n = 21 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 9 + 3n + -1n = 21 + n + -1n Combine like terms: 3n + -1n = 2n 9 + 2n = 21 + n + -1n Combine like terms: n + -1n = 0 9 + 2n = 21 + 0 9 + 2n = 21 Add '-9' to each side of the equation. 9 + -9 + 2n = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 2n = 21 + -9 2n = 21 + -9 Combine like terms: 21 + -9 = 12 2n = 12 Divide each side by '2'. n = 6 Simplifying n = 6
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